Screw



FIG. 1 is a perspective view of a screw showing my new design;

FIG. 2 is a front view thereof;

FIG. 3 is a rear view thereof;

FIG. 4 is a left view thereof;

FIG. 5 is a right view thereof;

FIG. 6 is a top plan view thereof; and,

FIG. 7 is a bottom plan view thereof.

The broken lines in FIG. 4 shows environment and forms no part of the claimed design. 

CLAIM I claim the ornamental design for a screw, as shown and described. 